Electro-galvanic medical apparatus



Apnl 8, 1930. A. FISCHER 1,753,854

ELEC'I'RO- GALVANIC MEDICAL APPARATUS Filed arch .'51, 1928 aglllllllllllllll'llilllI' l'ki'l ngz.

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Patented Apr. 8, 1930. L I

,UNiTi-:DM STATES PATENT oFFicE' VApplication Ied Haren 31, 192,8. Serial No.. 266,251.

The invention relates to an electro-'galvanic pole-reverser, with several switching `posimedical apparatus for supplying the parts tions. I of the human body with very Afeeble and ex- Fig. illustrates a construction of the regactlymeasurable currents, facilitating thereulatingresistance in the form of a rotary re- 5 by treatment, as well as convenicntreading sistance in side view and partly in section. 55

of the controlling apparatus. Fig. 6 shows the rotary resistancefrom be- The, electro-galvanic medicinal apparatus low and partly in section.

according to the present invention consists in The electro-galvanic medical apparatus ila receptacle, casing', or the like, containing lustrated' in Fig. 1 consists cfa receptacle, or

10 the required source of current, as, for incasingl for the source of current, which may, 60 stance, a dry cell battery, an electric regulatfor instance, be a dr cell battery2. Upon ing-resistance A(rheostat) a inilliampere-measpecial switch-boar cover 3, an electric regter and a pole-reverser, to which the connectulating resistance (rheostat) 81, a milliaming cords ofthe electric'means for treatment pere-meter 5 and a pole-reverser 80, all arare attached and by means of which, they galranged in full view. The pole-reverser 80 65 vanic current can be supplied to the parts 'of is provided with connecting terminals 7, with the body to be treated indifferent directions whichthe connecting plugs 8 of the cords 9 according to adjustment. f engage.'

The pole-reverser, according to the inven- The milliampere-meter 5, the multi-stepped tion is so arranged, that it is, for instance, pole-reverser 80 and the rotary resistance 81 704 fitted with 5or more switchingpositions,inak are disposed with their active parts below ing it possible to switch either a part, or the the apparatus plate 3.' Only the revolving entire battery into the circuit. A very fine button 63 of the pole-reverser, the revolvregulation of the feeble currents can thus be ing button 79 of the resistance,together with obtained for applications, not requiring any the readily visible scale arrangement of the 75 comparatively intensive current-s, as, for insame, thescale of the milliainpere-meter and stance, the treatment of the heart and head. the casing of the same and the connecting The pole-reverser consists of contact-bolts, terminals 7 for the plugs 8 are visible on the arranged in certain distances in a circle, a switch-board. y

rotary insulated plate, and spring pressed The rheostat 81, illustrated in Fig. lis proso contacts on said insulated plate adapted to vided with scale-marks 12, consisting of lines close the contact between two adjacent conor dots. These scale-marks 12 are made tact bolts. stronger Atowards one end and weaker to- Some parts of the subject of the invention "wards the other, the increasing scale-marks are in themselves known and protection is not Correspondmg t0 boosting 0f the eletlc CUI- 85 rent and the decreasing marks to a weakenclaimed for such parts.

Some modes of embodying the invention ing of the electric current. This construcb f tion of the scale makes it possible to perceive lgtrated m the drawmgs y Way O at oncle, tiwads which side the rhecstat 81 must e isp aced by the revolving button 90 is maarcercaincasa- 79' fdl-t0 may maak-ghe sistance, pole-reverser, several switching-polgiicstmlggrlnat h Oledal ,r sitions and apparatus for treatment connecticW-akwnmy be inscribed in order to facilitate ed there/50 in elevatloni and Partly h Sectlon' handling; still more. The scale-marks 12 95 Flg- 2 Shows the Pole''erser 111 51de VleWi may be of different form and'design, i. e. in- 'i in SeCtiOIl and Pilltly in elevation- 'stead of the `line and dot form, any other Fig. 3 shows the same from below and partform may be used, ly in section. In Figs. 2 and 3 a mode of constructing the Fig. 4 is a scheme of connections of the pole-reverser is illustrated by wayo'f example. 100

58 is around insulating base-plate, being screwed to a part l59 by a nut 60, and to a plate two oscillating rollers 56 and 57, representing the movable contact-surfaces of the pole-reverser, and two bolts 67 riveted into the plate n64. The large bore of the rollers 56, 47 enl' ables a safe snapping-in into the rests formed sitions IV (A+B-) andV (v-B+) inten formed b the contact-bolts 68, arran ed in a circle. he bolts 68 are riveted to the insulating part 58. The connection of the bolts 68 with the other parts of the medical apparatus is effected by soldering the connecting wires into axially drilled holes 69.

Fig. 4 shows a scheme of connections of the 100,000 ohms. The total resistance is so subdivided, that after winding up part 'of the wire, a loop of the latter is drawn through the slot 7'7 around a shoulder 78 of the bolts 72 shown in Fig. 5 and the wire drawn again through the slot 77 and wound up further. The next loopA passes through the vslot to the right of the one marked 77 tothe next boltand is soldered firmly together with the same, `simply b a drop of tin. Mechanical fastenlng of t e lU-shaped bow carrying the spring 74 with the pivot bolt 79 is like 1n the pole-reverser, done by riveting. 'urning the pivot-bolt 79 can be effected by means of but. ton 7 9 attached to the bolt.

The individual parts of the appara-tus may be designed in any desired manner, without transgressing the scope of the invention.

I claim:

y In an electro-galvanic medical apparatus the combination of a casing containing a pole-reverser with, for instance, 5 positions. source of current, a rheostat, a milliampere- In this scheme` of connections, A, B are the electrode-connections, 6 the .pole-reverser proper, 2 the source of current, 4 the regulating resistance, 5 the milliampere-meter and 56, 57 represent the contact surfaces of the pole-reverser.

In the position, indicated in the scheme of connections by I, the pole-reverser is switched on Out.

The positions II (A-l-B-) and III (A-B indicate feeble currents and the posive currents. With this pole-reverser it is possible to switch either part of the battery, or the whole battery into the circuit.

By employing the just above-described pole-reverser, the below. described rotary resistance is advantageously used, which can, as explained further down, readily be made in pairs with the pole-reverser.

The rotary resistance illustrated in Figs. 5 and 6, consists of an insulating disc 70, being likewise connected with the plate 7l by onehole fastening the same as the corresponding disc 62 of the pole-reverser. A large number of contact-bolts are riveted to the disc 70, in a circle carrying at their other ends an insulating ring 73. This insulating ring has an opening from which the disc 64 of the pole-reverser has been stamped out for the purpose of savin` material. Within the hollow space by the studs 72, an -anuular spring moves in tensioned condition, abutting with its open end firmly against a flap of the U- shaped bow 75, being with its closed end however guided by another flap of the part 75 and sliding on .f the bolts 72. This arrangement has been made in order to obtain a winding space of as large diameter as possible, which is, in its rectangular cross-section indicated by 76. It will be possible to wind upon this winding space 011 account of its large diameter a thin resistance wire of about 80,000

meter and a pole-reverser on said casing, said pole-reverser having several positions for switching in stronger and weaker currents and consisting of contact-bolts arranged at certain distances in a circle, a rotary insulating plate, and spring pressed contacts on Said insulating plate adapted to close the contact between two adjacent contact bolts.

In testimony whereof I have aixed my signature.

ANTON FISCHER. 

